I just played that battle myself actually,.. and I have to agree with hayashi.
My game also has Redemption, but it shouldnt make much difference.
I outright killed all enemies within a few rounds, leaving nothing but Bodhi.
So now I had Balthazar, and three other fighters + an archer + Irenicus + irenicus' simulacrum who is about evenly powerfull all throwing everything they had at her ...
I killed about 5 times, after which Balthazar got bored .. ran off .. chanted something .. came back and kicked her spirit out of her body
( probably that death-strike thing monks can do ...)
But that was just luck, she doesnt want to die any other way
